In short, Martin and Nicole are co-workers. Nicole's boss always had a complaint against her that she took too long to work with clients. Both of them do a small experiment where Martin signs emails as Nicole, and vice versa for a week. And Martin realizes that clients became more difficult when he signed as Nicole.

Nicole had the most productive week of her career.I realized the reason she took longer is bc she had to convince clients to respect her.

Now, consider things from the manager's perspective: he thinks Nicole isn't as productive as Martin because she ends up spending a lot of time with each client. If he has to lay one of them off, who would it be?